U04AEInvalid Data Received From Hybrid/EV Battery Interface Control Module N
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- U04AE stands for invalid data from interface module N, the fourteenth. Like the other high letters it can only appear on a large pack, and no manufacturer documents it publicly. What changes for the workshop is mostly practical: the board sits inside the sealed high-voltage battery, so after reading the freeze-frame data and ruling out the 12 V supply and the low-voltage connectors outside the pack, every further step means de-energising the system, measuring isolation and opening the housing, a job for trained staff with the maker's tester. Polestar, for example, bills a high-voltage battery disconnect with insulation measurement as a labour step of its own when a high-voltage part is replaced. U01AD means module N is silent, U0347 a software conflict.
- What you may notice
- Battery or EV system warning
- Output and charging power limited
- Likely causes
- Possible12 V supply or low-voltage plug of the pack at fault (check first)
- PossibleInterface control module N faulty
- PossibleContact fault on the internal link to module N
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €200 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.